I have had my zephyr for just a few weeks and one morning the battery was flat. I charged it up and it started OK. I´ve been for a run and it started cuting out on me. It started a couple of times and I got very close to home when it cut out again. The battery wouldn´t kick up the engine and then it wouldn´t turn it over. I assume the battery is dying but would this cause the engine to cut out when running?